FCS and FSG refer to the Federal Classification Supply and Federal Supply Group. These two terms are used to categorize and label certain aviation parts including FSC 1270 Aircraft Gunnery Fire Control Components and 40090-506-21, 40395-401-35, 40395-401-37, 40395-401-53, 40396-401-27. If you are in need of such parts, you can count on the professional team at Unlimited NSN to provide them for you.
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